Electrical Wiring in the Home/240/120 volt generator

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Question
I have a champion 3500/4000 volt generator. Factory set up with 240 129 volt.The 240 volt is a 4 prong twist lock plug. I bought a 4 prong twist lock plug.I want to wire it so it only supplies 120 volts. I assume the notched leg is the ground. Can I wire just two of the other legs to pull 120 volts. And does it matter which ones.

Answer
Robert Wilber
Licensed Philadelphia Electrician
Philadelphia License # 3516 - 16765
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LIFE SAFETY WARNING! [disclaimer]
Electricity is dangerous!
You can be injured or killed!
Improper installations can cause fire, injury and death!
Are you qualified to do this work?
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National Electrical Code definition, NFPA 70 2008 Article 100: Qualified Person. "One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved."
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Electricity is fire in a box!
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Always check with the local “Authority Having Jurisdiction” for an official interpretation before making installation decisions.
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In Philadelphia, it is unlawful for anyone except an individual licensed by the City of Philadelphia to install electrical equipment and wiring.
Homeowners are not allowed to install wiring.
The owner of any property wherein any such installation is discovered shall be issued a violation by the Department of Licenses and Inspections.
The limited exceptions include replacing devices and fixtures at existing outlets.
Contact the Department of Licenses and Inspections for more information.
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You are more likely to be killed by 120 volts than any other voltage [120 volts creates the PERFECT fatal current through the human body's electrical resistance!]
TURN THE POWER OFF WHEN WORKING!
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LIFE SAFETY WARNING! [disclaimer]
This information is provided for the use of parties as they see fit!
I am not responsible for the application of this information by any party, including those lacking sufficient skill or knowledge to perform these steps safely and any hazard created is the SOLE responsibility of the user.
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Never assume anything
The plug you bought came with a wiring diagram
The generator manual should tell you about the outlet on the machine.
Look up the NEMA configuration for the outlet. It should be an L-something-20 if I remember. I think an L14-20 is a 120/240 single phase grounding twist-lock.
Either hot plus the neutral and ground will give you 120.
Neutral is white, ground is green.
But why would you want to use it for 120 when you can get 2 120-volt circuits from it?
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Robert Wilber

Expertise

Licensed Philadelphia electrician serving Delaware, Chester, Montgomery and Philadelphia County in Pennsylvania. I install and repair residential, commercial and industrial wiring and lighting. Troubleshooting and repair of problems that stump other people is my favorite. I am willing to help people figure out why things don`t work. I understand motor controls, transformers and machine wiring. I do not teach basics to novices or do free design work.

Experience

Experience in the area I have 44 years experience in residential, commercial and industrial electrical construction and repair, 480 volts and below. This is not to be confused with one week repeated two thousand times.

Education/Credentials
44 years experience in residential, commercial and industrial electrical construction and repair

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